Dough mixer



June 17, 1924. 1,497,957

P. B. STREICH DOUGH MIXER Filed Sept. 4, 1923 Patented June 1?, 1924..

srA'rEs PATENT OFFICE.

PAUL B. STREICH, OF JOLIE'I, ILLINOIS, ASSIGNOR TO UNION MACHINERY COMPANY,

QF JOLIET, ILLINOIS, A CORPORATION OF ILLINOIS.

DOUGH MIXER.

Application filed September 4, 1923. x Serial No. 660,738.

To all whom it may concern:

Be it known that I, PAUL B. STRmoH, a

citizen of the United States, and a resident lowing is declared to'be afull, clear, and

exact description.

This invention relates .to dough mixers,

and morejparticularly it relates'to the bowl in which the dough is mixed. The principal object of the invention is to produce a more thorough mixing of the dough, to more thoroughly aerate the dough, and to materially reduce the time required for the .mixing operation. With objects and advantages in I tion consists in the several novel features hereinafter fully set forth and claimed.

mounted.

The invention is clearly illustrated in the in which:

accompanying drawing,

these and other view, this inven- Fig. 1 1s a vertical cross-section through a dough mixer embodying a simple form of the present invention, and Fig. 2 is a plan thereof,

partly broken away.

Referring to said drawing, which illustrates one embodiment of the present invention, the reference character 10, desig nat'es the main frame of the mixer which, as shown, comprises a base 11, and two hollow standards 12, 13, which rise therefrom. On the standards are bearing brackets 14 in which the mixing bowlv 15 is rotatively Means are provided, as usual,

for tilting the bowl to discharge its contents,

which means include pinions (one of which is shown at 9) that mesh with segmental racks (not shown) on the The mixing bowl 15 comprises two'heads bowl.

or ends 16, and front, bottom and .back walls, 17, 18, 18*, 19, preferably formed of a sheet of metal riveted to the heads or ends 16. The heads 16 are provided with hollow udgeons 20 which are rota-tivelymounted.

1n the bearing brackets 14.

In the mixing bowl is an agitator or mixing paddle 21, which is keyed upon stud shafts 22, that are journaled in the gudother blade backagain toward the end from geons'20, and roject into the hollow standards, where t ey have gear wheels 23 secured on them, which mesh with other gear wheels 24, mounted on ashaft 25. One of the gear wheels 25 is driven from any suitwill be readily normal curve of the forward part so as to agitator, as will appear later. v

The front wall 17 of the mixing bowl is preferably straight, and at its lower end curves down and back on a line concentric with the common axis of the bowl and agi-- tator, as at 18, to form the front part of the bottom wall of the bowl. Approximately midway between the front and back of the bowl, the curved bottom wall becomes eccentric with respect to the forward part of the bottom wall, and recedes from the leave a space or clearance 33 between the rear portion 18" of the bottom wall and the agitator blades 29, 30. whenthe latter are disposed adjacent. said rear bottom wall 18*. The eccentric portion continues upward along the same curve, forming part of the back wall.19 and it may have a reverse curved part 19 near its upper end. The curve of the bottom and back may be elliptical; if desired, to obtain the clearance between the back wall and agitator blades 29, 30. L I

In the operation of the mixer, the agitator rotates in the direction indicated by the arrows thereon in Fig. 1, the helical blades passing downward. at the eccentric part of the back and bottom wall and passingupward at the front and concentric portion of the bottom wall. Because of the particular shape of the helical blades 29, 30, the dough 100 is forced by one blade, first from one end of the bowl toward the other, and then by the which it was moved. In passing down, each blade 29, 30 engages the mass of dough at places somewhat distant from the back Wall 19, bringing down the dough below the blade, and leaving that part of the batch remaining between the blade and back wall as is illustrated at a, in Fig. 1, and that part of the dough falls forward after the passage of the blade, and is encountered in the same manner by the other blade. A morethorough mixing and kneading of the dough is thereby obtained, and a more thorough mixing and aeration of the dough results, and in less timethan is ordinarily required. More or less variation of the exact details of construction is possible without departing from the spirit of this invention; I desire, therefore, not to limit myself to the exact form of the construction shown and described, but intend, in {the following claims, to point out all of the invention disclosed herein. 7

I claim as new and desire to secure by Letters Patent: v

1. In a dough mixer, a mixing bowl and a rotary agitator therein having helical blades, said bowl having a curved bottom, part of which is concentric with respect to the axis of rotation of the agitator, and partof which is non-concentric with respect there to, the non concentric portion being contin ued above the axis of the agitator, the helical blades substantially contacting throughout their length, with said concentric part of the curved bottom of the bowl when passing said concentric part. a

2. In a dough mixer, a mixing bowl and a rotary agitator therein having helical, peripheral blades, said bowl having a curved bottom and back wall, parts of which are non-concentric with respect to the axis of rotation of the agitator, and part of the curved bottom of the bowl being concentric with the axis of rotation of the agitator, and substantially contacting with the blades of said agitator, throughout their entire length when the latter travel past said concentric .part of the bowl. 2

- PAUL B. STREICH. 

